Abstract
Increasing concerns about the ecological impacts of ongoing and possibly worsening blooms of the toxic, carcinogenic cyanobacteria Lyngbya majuscula in Moreton Bay, Australia, led us to assess differences in meiofaunal prey assemblages between bloom and non-bloom substrates and the potential dietary impacts of dense L. majuscula blooms on the omnivorous benthivore, the Eastern Long-finned Goby, Favonigobius lentiginosus and the obligate meiobenthivorous juveniles of Trumpeter Whiting, Sillago maculata. Marked differences in invertebrate communities were found between sandy and L. majuscula bloom foraging substrates, with copepods significantly more abundant (18.49% vs. 70.44% numerical abundance) and nematodes significantly less abundant (55.91% vs. 1.21% numerical abundance) within bloom material. Gut analyses showed that bentho-planktivorous fishes exposed to L. majuscula in captivity had consumed a significantly greater quantity of prey by both total number (P < 0.0019) and volume (P < 0.0006) than fish exposed to sand treatments. Thus, it is likely for such fishes that L. majuscula blooms increase rates of prey encounter and consumption, with consequent changes in trophic relationships through shifts in predator–prey interactions between small benthivorous fishes and their meiofaunal prey.
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Acknowledgments
We thank Craig Chargulaf, Angela Capper and two anonymous reviewers for their constructive and helpful comments. This project was partially funded by the Moreton Bay Research Station Community Scholarship. The authors would like to thank the brilliant staff at MBRS for their exemplary support throughout the project. The described experiments were conducted under the University of Queensland’s Animal Ethics Committee’s approval number CMS/816/08 and Marine Parks Permits QS2005/CVL319. The authors declare that they have no conflict of interest.
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Communicated by U. Sommer.
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Gilby, B.L., Burfeind, D.D. & Tibbetts, I.R. Lyngbya majuscula blooms and the diet of small subtropical benthivorous fishes. Mar Biol 158, 245–255 (2011). https://doi.org/10.1007/s00227-010-1555-9
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DOI: https://doi.org/10.1007/s00227-010-1555-9